Adolescent Femoroacetabular Impingement (FAI): Gender Differences in Hip Morphology
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1 Adolescent Femoroacetabular Impingement (FAI): Gender Differences in Hip Morphology Perry Hooper, DO Sameer Oak, MD Gehan Ibrahim, MD T. Sean Lynch, MD Ryan Goodwin, MD James Rosneck, MD International Society for Hip Arthroscopy - Annual Scientific Meeting San Francisco, CA September 15-17, 2016
2 Disclosures Perry Hooper, DO None Sameer Oak, MD None Gehan Ibrahim, MD None T. Sean Lynch, MD None Ryan Goodwin, MD Paid consultant for Stryker James Rosneck, MD Paid consultant for Smith and Nephew
3 Background Femoroacetabular impingement (FAI) has become an increasingly recognized cause of hip pain 8,9 FAI - abnormal bony offset or overgrowth creates irregular mechanical motion between the acetabulum and femoral head-neck junction 9 Repetitive contact from hip motion can damage the acetabular labrum and articular cartilage These morphological irregularities in adults can contribute to degenerative joint disease of the hip 1,3,6,12,13,17
4 Purpose Morphological differences between male and female adolescents with FAI have not been well published, nor is there a good understanding of the degree of potential intra-articular pathology linked to their condition. We compared male and female adolescents who underwent hip arthroscopy for FAI to ascertain radiographic and intraoperative differences. The purpose of our study is to determine if adolescent males have more preoperative bony hip abnormalities and more severe acetabular cartilage pathologies than adolescent females.
5 Methods Retrospective review of 177 adolescents, 13 to 18 years of age, who were treated for FAI with hip arthroscopy Inclusion criteria - patients who presented with hip pain along with signs/symptoms of chondrolabral hip damage, which led to primary hip arthroscopy surgery Exclusion criteria - previous hip surgery, history of hip dysplasia, history of SCFE, history of Legg-Calve-Perthes disease and patients where both MRI and plain radiographs were unavailable Only the first operated hip was included for patients who had staged bilateral hip arthroscopies
6 Methods MRI and plain radiographs lateral center edge angle, Tonnis angle, and alpha angle were measured and then compared with intraoperative findings Outerbridge system to document chondromalacia Grades 0-IV Labral pathology Normal Intact but with degenerative changes Chondrolabral wave sign/debonding evidence Full thickness tear with or without detachment Intraoperative procedures were documented
7 Imaging Measurement Agreement All measurements indicated moderate to strong agreement between the three readers
8 Imaging Results 38.9% of males and 1% of females had an alpha angle > 55 on axial oblique MRI (p<0.0001) Average Alpha Angle (p<0.0001) Males 55.9 Females % of males and 6% of females with lateral CEA >40 (p=.32) No statistically significant difference
9 Intraoperative Findings Males - more likely to display chondral injury intraoperatively (56.3% versus 32.5%; p<0.0001) Males with cam deformity 64.3% Debonding evidence or full thickness tear to the labrum was seen 69.8% in females and 72.9% in males Males underwent femoroplasty and acetabuloplasty (75% and 62.5%) more often than females (56.6% and 48.8%) [p=0.025 and p=0.11]
10 Intraoperative Findings
11 Conclusions In adolescents, distinct differences between sexes were seen on both preoperative imaging and at the time of hip arthroscopy We found that males with FAI displayed a larger mean alpha angle, and therefore a more severe cam-type deformity, than females Males were 20% more likely to have chondral injury than females Longitudinal studies are needed to ascertain if surgical intervention at a young age will prevent early onset degenerative hip disease
12 Retrospective study Limitations Disproportionate number of females - 73% Recent study with Dr Philippon - 69%; Microinstability/ligamentous laxity increases hip ROM? Our alpha angle measurements may be an underestimation Recent data suggests radial imaging may better capture anterosuperior portion of the femoral head-neck junction where cam lesions typically occur No gonadol shields were used so the imaging reader could identify the patient s gender The crossing sign was not documented
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